Padlock



(ModeL) 0. o. DICKERMAN.

PADLOGK. No. 264,445. Patented Sept. 19', 1882.

finished.

U ITED STATES' PATENT OFFICE.

CHARLES C DICKERMAN, OF BUSTON, MASSACHUSETTS.

PADLOCK.

SPECIFICATION forming part of Letters Patet No. :264,445, dated September 19, 1882.

' Application filed November17, 1881. (ModeL) To all whom tt may concern:

Be it known that I, UHARLES G'. DIOKER- MAN, of Boston, in the county of Suffolk and Oommonwealth of Massachusetts, have in- 5 ventedanewand usefullnprovementin Looks,

of which the following is a speoifioation.

The object of my invention is to produce an inexpensive but substantial and reliable lock, which, when made with two or more lookingbolts and tuniblers, cannot be unlooked bylany instrument except the key made for it; and it consists in the peculiar form and arrangement of the looking-bolts and of the tumblers, and the operation thereof.

In the drawin'gs annexed, Figure l shows a side view of my lock, which in this case is a padlook with one side of its case removed, eX- posing all the parts to View, and the hasp down and secured by the looking-bolt, and thus engaged and seoured by a looking dog or tumbler. Fig. 2 shows the same as Fig. 1 with the hasp up and the looking bolt and dog disengaged. Fig. 3 shows a side view of the looking-bolt and its spring. Fig. 4 shows a side View of the looking dog or tnmbler 'and its spring. Fig. 5 shows a side View of a padlook with one side of the case removechand having a rotatng trunnion in the key-hale, and which is opened with a flat or plate key, as shown in Fig. 7. Fig. 6 shows a side View of a key for the look, as shown in Figs. 1 and 2. Fig. 7 shows a side View of a flat or plate key for the look, as shown in Fig. 5. Fig. 8 shows a seotion of' the padlock as shown in Fig. 1 on a vertical line across the middle of it.

a is the case of the lock.

a is the pivot upon which the hasp swings, and is also a rivet holding the two sides of the case together at this pointwhen the look is 0 a is the spring, which is attached to the back side of thelookin g dog'or tumbler a and which, working againstthe pin a throws the upper and engaging end of the lockingdog a into the notch on the back side of, the lookingbolt, thereby securing the looking-bolt in a' & is the pivot on' which the key is placed in the lock and turned.

e is a pivot upon which the looking-bolt & swings.

e' is the pivot upon which the looking dog or tumbler (0 swings.

e is the looking-notch in the back edge of the looking-bolt a in which the upper end or en gaging-bolt of the looking dog or tum'bler af' is thrown by the action of its spring a 6 is the engaging-bolt of the looking dog or tnmbler a?, which, being thrown by the action of the spring a into the notch e in the looking-bolt, holds it securely locked.

6 is a spiral spring which may be used instead of the spring a c isatransverse section of the key in the look.

6 is the :revolving trunnion in the key-hole, as shown in Fig. 5.

The hasp a?, the looking-bolt (6 and the locking dog or tumbler a are the moving or working parts of the look.

In Figs. l and 2 two looking-bolts and two looking dogs or tumblers are shown, and any desirable number of both may bo placed in a lock. Thelooking-bolts and the looking dogs or tumblers may be made by punohing them out ot' sheet metal of a proper thiokness, or by molding and casting, or in any other known manner, all alike except as to the notohes a and e and the lower ends or points of the looking-bolts, which are milled or otherwise cut in forms varying a little, and the lower ends of the looking-dogs w" may also be varied in form, so that they will not range exactly in line. The edges of the key-hits are notched, so that when they are turned against the lower IOO ends of the lockin g-bolts and looking-dogs they will strike all of them on both sides, theloekingdogs first, so as to disengage the engagingbolts 0 from the notches 0 so that the notches a can engage with the bolts 6 and then the keyen gages the lower en ds of theloeking-bolts, throwing theni out of the hasp and throwing the notches a in the looking-bolt into line, so that when the looking-bolt is thrown back they will fall onto the engaging-bolt 0 The lower ends of the looking-bolts a and of tleloekin gdog a may he so shaped that the two sides of the double-bitted key shown in Fig. O will exactly connterpart, so that the key may be put into the lock either side up and turned either way to open the lock; or they may be so shaped that one side of the key must be adapted to work against the looking-bolt and the other side to work against the looking dogs or tumblers. To close this lock and secure it, it is only necessary to bring down the hasp into place, when the springs a and a throw the lookingholt into the hasp and firmly secure it there by the looking-dog passing under the rear part of the locking-bolts The notches 0 in the back side ot' the looking-bolts a are used as stops for the looking dogs or tumblers (6 prineipally, and may be used or not, as desired.

If two or more of the looking-bolts and of the looking-dogs are plaeedin a look, it is practically an impossibility to open the look without its key. None but a skillful expert would pick such a lock.

The case of the lock may be made ot' brass or iron or any suitable metal, and in any suitable form, either cast or struck up in two oi'- more part-s, or in any other known manner produced. I, however, prefer to make the case in circular form, with the sides crowning, as shownin drawings. The crowning shape adds strength to the ease, and consequently makes t sides, servesin this case to securely confine the( looking-bolt a, in position when the lock is locked, so that it is impossible to disengage the latter from the hasp until after the dog (0 has by the operation ot' the key been passed into the noteh w* of the bolt a I claim 1. In a padloek, the looking-bolt a provided with the notches a' and e in conbination with looking dog a as shown and described.

2. In a padlock, the looking-bolt a and the .looking-dog (1 in combination with the double bitted key, one bit of which engages the lower end of the looking-bolt and the other the lower end of the looking-dog in nnlocking, substantially as shown and described. y

CHARLES C. DIGKERMAN.

Witnesses:

F. M. LORING, CHAs. G. WILLIAMS. 

